Since you're on-road, you should get an all-terrain instead of a mud-terrain (Rubicon takeoffs). M/Ts don't handle the rain/snow quite as well but are great in the mud and rocks.
I went with Firestone Destination A/T when we replaced our SR/As and have been happy thus far. They have a more aggressive tread pattern so they look a bit better than the SR/As, too. More proper in my opinion.
They did well in the snow last year, but they were new, so that's to be expected.
The 255/75 leaves little options for upgrades, while going up to 285/70 offers many more choices (DuraTrac), but will likely rub when you turn.